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Search the archives - Doug Harland (DRH4683) posted about one he had that is similar to yours - he replaced the Callins capacitors to get his working IIRC. Callins caps are easy to identify - black body, red epoxy end. I've replaced thousands of them. They were the one weakness Zenith built in - every one eventually went bad. Don't fret on values - 15 and 20 microfarads can both be replaced by a 22uf modern type. You may also have the white Mallory caps - replace them too.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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